main: Only show DRD deprecation warning once

src/core/file_sys/submission_package.h

@@ -13,10 +13,11 @@
 #include "core/file_sys/romfs_factory.h"
 #include "core/file_sys/vfs.h"
 #include "core/loader/loader.h"
-#include "romfs_factory.h"
 
 namespace FileSys {
 
+class PartitionFilesystem;
+
 class NSP : public ReadOnlyVfsDirectory {
 public:
     explicit NSP(VirtualFile file);